Well Apexi doesnt make a N1 catback for the 6th gen accord, but u can just buy the N1 muffer and get a custom pipejob; and be sure to get the REAL Apexi N1 muffler, not the "N1 Style" knockoffs, there IS a difference. But I wouldnt get the N1 if u want OEM looks, the muffler just hangs there.

Im not sure about how loud the Greddy SP is but they pretty much look OEM to me. But trust me, if u want a OEM look AND quiet, dont go for the Greddy EVO, its loud if u ask me. People prolly say its quiet becuz of the nice, deep, throaty sound it makes compared to all the ricer APC mufflers out there, but its not quiet tho. Im not hating on the Greddy EVO, I actually love mines, but im not recommending it to someone who wants a quiet muffler and a oem look.